Hello all!
Recently completed a 5.3/4L60E swap in my 95' YJ Wrangler. So far things are finally getting there but I have another issue that came up once I was able to get to a dyno and start tuning. When running a pull on the dyno and/or while data logging, over 4k RPM the MAF simply flat lines. We assumed a bad MAF so I replaced it with a brand new OEM Delphi MAF...same problem! I am running one 3" high flow CAT which is new, 255LPH fuel pump (new), Holley fuel rails on a stock intake (LSXRT design), 2004 LS6 cam, 10:1 compression, 243 heads. All components are new/rebuild as this was a frame off build.
In order to rule out the MAF or something else, we ran a speed density tune and it ran no issues. Does anyone know what could be causing this issue? My dyno tuner wants to run it speed density but I want to figure out what it causing the issue before I simply ignore it.
I have attached the tune and data logs I took recently for reference. Really appreciate the knowledge and assistance here!
-Domenic